diff --git a/lib/ruby_llm/schema.rb b/lib/ruby_llm/schema.rb
index 6f49d01..414fced 100644
--- a/lib/ruby_llm/schema.rb
+++ b/lib/ruby_llm/schema.rb
@@ -175,7 +175,7 @@ def method_missing(method_name, ...)
     end
 
     def respond_to_missing?(method_name, include_private = false)
-      %i[string number integer boolean array tuple object any_of one_of all_of none_of null].include?(method_name) || super
+      %i[string number integer boolean array tuple object any_of one_of all_of none_of raw null].include?(method_name) || super
     end
   end
 end
diff --git a/lib/ruby_llm/schema/dsl/complex_types.rb b/lib/ruby_llm/schema/dsl/complex_types.rb
index bc71a14..5e483f5 100644
--- a/lib/ruby_llm/schema/dsl/complex_types.rb
+++ b/lib/ruby_llm/schema/dsl/complex_types.rb
@@ -32,6 +32,10 @@ def none_of(name, description: nil, required: true, requires: nil, **options, &b
           add_property(name, none_of_schema(description: description, **options, &block), required: required, requires: requires)
         end
 
+        def raw(name, schema, required: true, requires: nil)
+          add_property(name, normalize_raw_schema(schema), required: required, requires: requires)
+        end
+
         def optional(name, description: nil, &block)
           any_of(name, description: description) do
             instance_eval(&block)
diff --git a/lib/ruby_llm/schema/dsl/schema_builders.rb b/lib/ruby_llm/schema/dsl/schema_builders.rb
index 8399692..14d1f43 100644
--- a/lib/ruby_llm/schema/dsl/schema_builders.rb
+++ b/lib/ruby_llm/schema/dsl/schema_builders.rb
@@ -203,7 +203,7 @@ def none_of_schema(description: nil, **options, &block)
 
           schema = metadata.merge({
             description: description,
-            not: schemas.one? ? schemas.first : {anyOf: schemas}
+            not: schemas.length == 1 ? schemas.first : {anyOf: schemas}
           }.compact)
 
           merge_schema_block_keywords(schema, schema_block)
@@ -240,6 +240,19 @@ def merge_core_keywords(schema, schema_class)
           schema.merge!(schema_class.schema_core_keywords)
         end
 
+        def normalize_raw_schema(schema)
+          case schema
+          when Hash
+            schema.each_with_object({}) do |(key, value), normalized|
+              normalized[key.is_a?(Symbol) ? key.to_s : key] = normalize_raw_schema(value)
+            end
+          when Array
+            schema.map { |value| normalize_raw_schema(value) }
+          else
+            schema
+          end
+        end
+
         def raise_unknown_options!(type, options)
           return if options.empty?
 
@@ -333,6 +346,18 @@ def collect_schema_block(&block)
             schema_block.keywords[:contentSchema] = schema_builder.send(:collect_schemas_from_block, &blk).first
           end
 
+          context.define_singleton_method(:any_schema) do
+            schema_block.schemas << true
+          end
+
+          context.define_singleton_method(:no_schema) do
+            schema_block.schemas << false
+          end
+
+          context.define_singleton_method(:raw) do |schema|
+            schema_block.schemas << schema_builder.send(:normalize_raw_schema, schema)
+          end
+
           context.define_singleton_method(:description) do |value|
             schema_block.keywords[:description] = value
           end
diff --git a/spec/ruby_llm/schema/properties/boolean_and_raw_schemas_spec.rb b/spec/ruby_llm/schema/properties/boolean_and_raw_schemas_spec.rb
new file mode 100644
index 0000000..667e49e
--- /dev/null
+++ b/spec/ruby_llm/schema/properties/boolean_and_raw_schemas_spec.rb
@@ -0,0 +1,73 @@
+# frozen_string_literal: true
+
+require "spec_helper"
+
+RSpec.describe RubyLLM::Schema, "boolean and raw schemas" do
+  let(:schema_class) { Class.new(described_class) }
+
+  it "supports true schemas inside composition" do
+    schema_class.any_of :value do
+      any_schema
+      string
+    end
+
+    expect(schema_class.properties[:value]).to eq({
+      anyOf: [
+        true,
+        {type: "string"}
+      ]
+    })
+  end
+
+  it "supports false schemas inside composition" do
+    schema_class.none_of :value do
+      no_schema
+    end
+
+    expect(schema_class.properties[:value]).to eq({
+      not: false
+    })
+  end
+
+  it "supports raw schema properties" do
+    schema_class.raw :role, {
+      "type" => "string",
+      "const" => "admin"
+    }
+
+    expect(schema_class.properties[:role]).to eq({
+      "type" => "string",
+      "const" => "admin"
+    })
+  end
+
+  it "normalizes symbol keys inside raw schemas" do
+    schema_class.raw :payload, {
+      type: "object",
+      properties: {
+        role: {const: "admin"}
+      }
+    }
+
+    expect(schema_class.properties[:payload]).to eq({
+      "type" => "object",
+      "properties" => {
+        "role" => {"const" => "admin"}
+      }
+    })
+  end
+
+  it "supports anonymous raw schemas inside composition" do
+    schema_class.any_of :value do
+      raw type: "string", const: "admin"
+      integer
+    end
+
+    expect(schema_class.properties[:value]).to eq({
+      anyOf: [
+        {"type" => "string", "const" => "admin"},
+        {type: "integer"}
+      ]
+    })
+  end
+end